Author Topic: LIVE: SpaceX - Falcon I (Mk.II) NET March 20 (Attempt 2) (Read 265128 times)

braddock · « **Reply #220 on:** 03/20/2007 11:53 pm »

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wannamoonbase - 20/3/2007 8:53 PM

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braddock - 20/3/2007 8:50 PM

Q: what would you like fuel temp to be.
"We like it to be between 78 -80 deg F, it was 76." [they don't abort on fuel temperature, just chamber temp.]

Chamber temp or pressure?

typo, sorry, she said chamber pressure, not temp.

ringshot · « **Reply #221 on:** 03/20/2007 11:54 pm »

The wind seems to really be cranking... what is their criteria for that? any concerns voiced before?

G'Day...Ron

Skinny · « **Reply #222 on:** 03/20/2007 11:54 pm »

Chris Bergin · « **Reply #223 on:** 03/20/2007 11:54 pm »

Second stage fueling complete. Count re-starting in 30 seconds.

josh_simonson · « **Reply #224 on:** 03/20/2007 11:54 pm »

Part of their DARPA goals is to demonstrate responsive launch, they certainly are doing that today.

Chris Bergin · « **Reply #225 on:** 03/20/2007 11:55 pm »

T-16 minutes and counting.

ilia25 · « **Reply #226 on:** 03/20/2007 11:55 pm »

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NASA_Twix_JSC - 20/3/2007 7:52 PM

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Danderman - 20/3/2007 7:51 PM

Does anyone have any insight as to how SpaceX plans to fix the low chamber pressure issue? I am certain that their plan is not to simply try again, this time with their fingers crossed.

I get the impression they are simply going to try and again and hope it was a one off.

Warmer fuel should fix the chamber pressure

braddock · « **Reply #227 on:** 03/20/2007 11:55 pm »

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ringshot - 20/3/2007 8:54 PM
The wind seems to really be cranking... what is their criteria for that? any concerns voiced before?

They have a very high ground wind tolerance. It is not supposed to be an issue.
(I wish the camera had a better time with it though...)

charlieb · « **Reply #228 on:** 03/20/2007 11:55 pm »

looks/sounds like the engine/turbine ran up to 'full thrust' but the chamber pressure was low enough to voilate the limits (redline) and abort occured.

braddock · « **Reply #229 on:** 03/20/2007 11:55 pm »

Count has resumed at T-16.

Nick L. · « **Reply #230 on:** 03/20/2007 11:57 pm »

Polling of team shows all are go!

braddock · « **Reply #231 on:** 03/20/2007 11:59 pm »

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charlieb - 20/3/2007 8:55 PM

looks/sounds like the engine/turbine ran up to 'full thrust' but the chamber pressure was low enough to voilate the limits (redline) and abort occured.

Only low by .1% of thrust.

Cretan126 · « **Reply #232 on:** 03/21/2007 12:00 am »

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josh_simonson - 20/3/2007 6:54 PM Part of their DARPA goals is to demonstrate responsive launch, they certainly are doing that today.

Not really. The DARPA objective was to go from start of payload mating to launch in a given time, say 7 days. Weeks, months, and years of slips - with 'dumb' payloads - doesn't exactly accomplish that goal.

Chris Bergin · « **Reply #233 on:** 03/21/2007 12:00 am »

Coming up to T-10 minutes and re-entering the terminal count (again).

aero313 · « **Reply #234 on:** 03/21/2007 12:01 am »

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braddock - 20/3/2007 8:59 PM

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charlieb - 20/3/2007 8:55 PM

looks/sounds like the engine/turbine ran up to 'full thrust' but the chamber pressure was low enough to voilate the limits (redline) and abort occured.

Only low by .1% of thrust.

The problem is that you create mission constraints documents prior to launch specifically so you don't feel obligated to violate your own rules on launch day.

Nick L. · « **Reply #235 on:** 03/21/2007 12:01 am »

Vehicle is going to internal power again.

Chris Bergin · « **Reply #236 on:** 03/21/2007 12:02 am »

Ok guys, let's cut the chatter down again at T-5 minutes.

Jim · « **Reply #237 on:** 03/21/2007 12:02 am »

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WHAP - 20/3/2007 8:45 PM

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Jim - 20/3/2007 6:36 PM

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Nate_Trost - 20/3/2007 8:30 PM

Is rain an issue on the vehicle surface with LOX loaded?

Ice is not an issue for ELV's, only the shuttle.

Too many people have grown up on the shuttle and don't watch ELV's

What about ice shedding onto SRB's on an ELV?

no issue

Skinny · « **Reply #238 on:** 03/21/2007 12:02 am »

Nick L. · « **Reply #239 on:** 03/21/2007 12:04 am »

Flight termination system is ready. Inertial navigation alignment is proceeding.